Power-operated check valve



17, 3948 D. e. GRISWOLD 2,447,493

POWER OPERATED CHECK VALVE Filed May 29, 1943 2 Sheets-Sheet 1 Patented Aug. 17, 1948 FFICE' Q-2,447,408 :PoWERoPERATEn CHECKVALVE d, Alhambra, Califl, assignor to acturing Company, Alhambra,

I Appi t n Mafla 1943 ,-Seri:al No. 489,007

The present invention relates to check valves and more particularly to an auto'mati-ccheckvalve adapted to be usedin.aiwater supply line' con-, nectedwi-thapump.

More specifically, the invention relates to a highly sensitive, automatic check valve which will close completelyuin response to the pressure onthe outlet side oi said valve when the pump is shut down and which will not open until after the pump has built up apressure on the inlet side of said valve which is greater than that in the line on the outlet side of said valve. Another object of the inventionds to provide a check valve of large capacity which i poweroperated to effect both the positive full-opening and full closing of the valve in accordance with pressure changes in the line onthe inlet and outlet sides of said valve. I. 1 d

Another object of the inventionis to provide an automatic, power-operated check'valve. that will close at a predetermined rate, regardless of the difierence in pressure on the -inleteand outlet sides of said valve, and;therebyavoid'toosudden closing of the valve Withresultaflt, line shock;

Another object of the inventionis' to iprovidei a pilot-controlled, power-operated; check valve which is highlysensitive in its operation "andyet isnormally held in its full open position, in order to prevent restriction or resis-tanceto" the flow of liquid through the body of thevalv'e, or held fully closed'in drip-tight relation. i i

Another object of the invention is to pro'vide an automatic, hydraulically operated check valve which derives its operating fiuidffrom' eitherth inlet side or the outlet side of the valve,'depending upon which side is'subj'ectedto the highest pressure. r k I A further object of theinvention is to provide, in a waterlpumping system, a flow control valve having a pilot valve associated therewith' which is operable in accordance with the pressure dif: ferential on the inlet and outlet sides of saidflow control valve, and wherein 'oper'a'ting' fiuid for eifecting power or outside side of said pending upon which side er pressure.

fio'w' control valve, de-

A still further object of I the invention is to provide a pressure-responsive contro1 means for a hydraulically operated main valve in which the.

Want n valve is f te si iv im crating,

operation of the" main valve can be taken by said pilot valve fromeithr'the inlet is subl'eoted'to the high-- a 42 cla ms. w ice-i15 orfull.closing ofsaid inain valve inaccordance with variations in the differential pressure.

Other and further objects of the invention will be. apparent from the followingdescription taken inI conjunction with the accompanying drawings, in;.whicl1: I

Fig. 1 schematicallyillustrates a water supply system including a pump, and an automaticcheck valve. and pilot control means constructed in accorda'ncelwith the prin'ciplesLof theipresent'ine vention ,(thepart .not being drawn to the same relative scale);

Fig. 2 is adiagrammatic, longitudinal sectional view'taken'through the-c eck valve and the pilot valve otFig. l'; V

, Fig;v 3' is ahorizontal sectionalviewthrough the pilotvalve taken on the line 33 of Fig. 2;-

.fiig. is aiscatter'ed view of the pilot disc, pilot disc seat, and fluid distribution base of the pilot valve, f particularly showing therelative positions ofthe. ports inthes'e parts; and I liFig' 5Lis an enlarged sectional view through the, pilotdisctaken .on the line 5 5 of Fig. 4.

- Referring now .to' Figure 1 of the drawings, the numeral I generally indicates the hydraulically operatedmainor checklvalve and. the numeral 2 generally indicates the pressure responsive pilot valveifor controlling said-main valve. The check valve I ise-connected atitsinletend 3 toone end of a pipeline .4 and the opposite end of said pipeline is connected with -the.discharge outlet 5 of afconventional centrifugal pumpy6..=,The outlet side 1.0f thecheck .valve I is connected tonone end of a pipeline. 8, theopposite endofwhich is connectedwitha water storage tank 9'or other source of demand. ,I-t .wil1.be apparentv from .the foregoing,.thattheslnlet side 3 of. the check valve (is subject -.to thepressure ,of the fluid in the pumph line ,4,,.whereas.i.th e outlet .sidejl of. the

check valve is subject to thepressureofthefluid in the pipeline}; which ,variesin accordance with thedemand. The .checlr valve [comprises a body I 0., which terminates at. its pposite endsinj the previously mentioned. inlet and. outlet ends} and,1,.respe'c-.

tively. The. body lfliis provided with an internal partition wall ll, ,whichldivide thevbodyinto inletand outlet openings 3 The partitionjl'l is. provided with a flangeJZ surrounding afcircularuopening 1,3 which .estab-i lish'e's coinmunication between the-inlet opening 3mm the o'utletopening 1?. An annular seat. I 4 rests upon the face of, theLfiange I2 and is secured thereto by screws I 5. jllhe check valye I ,also, c0mp13i ses an 7 interme';

and 1 respectively,

hi f hf i h cates with'aradial passageway Bl which in turn. with "a pipe fitting 90 connected communicates" with on'e'end of a conduit i, the'other 'end'of' which'condu'it is connected with a fitting' 02 communicating with the pressure chamber 41 above the main diaphragm 25. The passageway 82 communicates with a radial passageway 82 which'jinturn communicates with a fitting 93 connected with one end of a conduit 94, the opposite end of which conduit is connected with a' size where line shock is a seri the pressure differential in the inlet and outlet chambers 3 and1 of the main valve I. This is accomplished by incorporating a pressure-responsive pilot diaphragm I00in the pilotvalve housing 60. Thus, as shown in Figure 2, the pilotvalve housing 60 is provided; with a compartment I III which is connected by a pipe I02 with the outlet opening I of the main valve. A cap I03; which is secured to the housing 60 by screws I04, clamps *thediaphragm I00 in place and is provided with 'a compartment I05 connected by a pipe I06 with the inlet opening 3 of the main-valve; Thus,'the pilot diaphragm I00 has its opp'osite'sides exposed to the pressure in the inlet and outlet openings 3 and 1 of the main valve I. 1

The pilot diaphragm I00 is disposed between diaphragm'supporting plates I01 and I03 secured to'a reciprocablerod' I09 by a nut H0. One end of therod I09 is slidably supported in a recess I- I fin the cover I03 and the opposite end of said rod is. supported in a recess H2 in the housing 60. The rod J09 is provided with a series of annular ridges H3, best shown in Figure 3. The ridges H3 mesh with the teeth of a gear II4 mounted upon the upper end of a shaft H5; The shaft 'I.I5 extends I I6 in the pilot housing 60 and is p leakage by a smiling box II1 so that fluid from the pilot disc chamber 10 cannot leak out along the shaft'I I6 and into the compartment IIII, and

packed against iyin the pilot disc 19 to' provide a driving connectionbetween the drive washer I I 8 and said disc; A spring I2! disposed between the drive washer 'I I3 and the pilot disc 19 urges the pilot disc Lddwnwardlyto hold said pilot disc against its seat, whereby foreign matter is prevented from getting between said disc and seat should thezfluid pressure fail in chamber 11. The upper end'iofthe" shaft H6 'is' received in a plug I22 threaded into the housing 60.

Figure 2 shows the pilot diaphragm I00 flexed toward the right, as when the pressure in the outlet opening 1 of the main valve I exceeds the pressure in the inlet opening 3 of said main valve I and at which time said main valve should flexing of the diaphragm I00 toward the right necessarily will have caused a shifting of the rod I00 to the right with the reimportant, especially in of the gear H4,

' atthe'lo'wenside of the" diaphragm i2 5.

sult thatthe ridges I.I3 "cause the gearll l and its associated pilot "drive :shaft 1116 to. rotate countereclockwise through an angleofi GOffttake the position shown in Figure l Such movement will position the leg 85 of'the' u-shaped exhaust passageway 85"of the pilot disc 19 in registration with the port 82 of the pilot disc .seat'181 and the through passageway 83 will register with; :the portal. Operating fluid under pressure can 1then fia'fi ii bmlthfinilq sczchai be lfithtoush th thrdu'gh p'assageway 8310f itheipilot' disc .19, port 8!, passages spend al in the base' member BI, through 't he fitti ngf 90," conduit '9 I and fitting 92 into 'thel'u per portion of the pressure "chamber; @Iito thereby gradually fill said chambe'nand; sex thelfdiaphragm 25 downwardlyj forcing the valvefstemrlzii'to movegin aisin ilarf' di satin-e1" closu e ham r .325 v s i I sefat lists an on nowbetweent e inlet andi'out e lopeninss-a 'and1B,:respectivelyiofit valvef'i The needlj valve 96' connected in" t}; l, duit 9I' "wi11'.1imit "the rate'fatt hic he a is fluid eaninowfrom-thematic v c"chamb.er'19 one: the pressure chamber ,4 I and jtherebj'yj pbs'itive' ly control" the. rate at' whichlthefmain valve I",.wlllf simultaneousiwith'Ithe,int odl cti prop r ing fluid under pressure intotlie'chamberj 411th. effect closing'of'themainwalve, spent operating. fluid is exhausted from the pressure "chamber Mia spent operating" fluid leaves, the pressure chamber; 4 I through the conduit ildf passageways 82k, .82 in -the'bas'e member 8 If port B'ZTin theQpilot disc; se'atfwl'through the 'u shape' diexhaust passage-'1 way '85 in the pilotldiscl1'9, axia1 portf00 inLthe; pilot discse'at 18,then-throu:gh passagesfifl and; 00 inthe base memberQIBI and finally,intqz the. drain tube 89- I f It will also belappare'nt 'that when the pressure on the inIetT-sidTS.IofJthe valve; I Xceeds the pressure on the outlet side 1 of said valve, as when the pump 6 has been startedfth'epressure in the inlet opening 3 cf the-main-valve I will becommunicated to the compartment I05 or the pilot valve housing 60 through the pipe I 06; and the pilot diaphragm I00 will be flexed toward the left, as viewed in Fig.2. 'Suohl fiexing' of the diaphragm I00 causes shifting of the rod I09 toward the left with the consequent rotation shaft H5 and pilot disc 19 clockwise through'an angle of 60 to position the Us. shaped exhaust passageway 85 of the pilot disc 19 in registration with the port 8| in the pilot disc seat 18. .This same movement will-positionthe through-passageway 84 of the pilot-disc-19 in registration with the port 82 in the pilot disc seat 18. Asa result, operating fluid under pressure to effect opening of the" main valve I will then flow from the pilot disc chamber 11 through the through-passageway 84 in the pilot disc 19, port 82 in the pilot disc seat 18, passages BZ and 82 in the base memberGI, and thenthrough the conduit 94 to the pressure chamber Me at the lower side of the diaphragm .25;thereby-;efi ectingt upwardmovementof the valve stein-1228 with the consequent opening of the main valve I. Simultaneous with the introduction of operating fluid under pressure into the chamber II, spent operating fluid is exhaused from the chamber 4| through the conduit 94, passages Ill and 8| 0 in the base member 6|, port 8I in the pilot disc seat 18, through the U-shaped exhaust passageway 85 and the pilot disc 19, and thence through the port in the pilot disc seat 18, passageways 80 and a tub aa'tb the a medium. a s .s i ralsbj e apparent that th main valve i f dlfiit 1i H 1? 61 1 11 or fi y f tidfn andtnat the pmsummember 32 of rijvalve not, iiiitter ,betweeh open pbs on whilethe pre sure differential chan is .f rdfi'rone side 'oithe valve to pilot diaphragm mu must .antifillYfllllY fix'edpb'siti'o'ri ithei' right r reward th'elft to alignthe that disc 19 withthe ports a is t 1 3. jJnpther words, the VI remain runy closed until the muirasbeennexedtbward the fillciei ifiuta rotate the' pilotl disc t 69?; ,Wheritheshaft wiiib'eevideint that none o f Lethe, pilotjdisc .19 lies .in vreg-z hrefo're, mamas ithr admitted 'res siur ehamberstl 3 aid? an hli nv a 1. a closed u'ritiithe U-shapeexhaust passageway 85 registers with the. port. 8| in the pilot :disds'eat 11 vireiz sc i the mam 'yalve l win. open in the m ripe be t org described; ..Sim i1ar1y, the main in twin em, j fully open uritil the, .u -shaped e as: eWaYBB has been shifted'to a p0,:

11 reg tiiatigirWithth port 82 to effect .ng ois mainvalyet bej nd rst rod om .,the\.jmic oin t at qheokyalve' L is operated automatically ps sete slight pressure ,variations in th and outlet openings ot the main valve, and be $1 ma nfla ra itten he i m dfedfiventional check valves", assumeseither a fully open or f g11y closed position. inaccordance h mange x fihe re s dif er a iiig' thus described the invention, What is claimed is:

d s j b ii e ba e member secu ed oi A s 'ai 'holi n h in va oisc sh m he adjafcht said base me nher adapted toreceive ope tirig flj id 1r'1 (i'e. r pressure; a pilot disc seat 1Qs1 re ,..s d pilqt dis ch m v d 1111a d sc nv ai lo disc fil i ei Q JP flH i O1s at h v n n 1 4 oge'fiihg said base member having an axial -$5 W ir cem u i at ngrwith s id axial p rt arid di$. har' ine; t9 h a mo here; sa d pi t dis having a p-shaped exhaust passageway; one

h in s n ant ecmm n on with the a; 0; said pilot dise seat; said pilot disc it and said base member also having alis mam p d l mb and pa a a s res qavems d 'pilot disc having through passageways arrai'igd orie ugiori each side ofsaid' Li-sfiaiied 'eXha" st passagewafi anduiuon an angle relative to said U-shaped passageway correspondmg to-that of the angular spacing ofthe ports iiisa'idiiilot dis; seat; the other leg ofsaid u shapedexhailst pa sageway being adapted to reg} EH3?" With' th angel-any Spaced P OitS in Said 1' i1bi vawemea s, comprising; a hoiisihy amiss 2-..12 o a r a o r in aliasing and,

a fluid distributing base the secured to said a hous n sai m in haviheapilotdisep m:

b'eradiaiceritsaidbase membe ,adahtedtd rce e operating fluid u iderpress'p aipilot disgseat formingfa closure remain pii'dt disc eiiaippema rotatable; ported fliiot disc it} said pn- 4 chamber; said pilot disc sieatjehavihg X131 an dhae memherhavin'a an'ag al 2 e way cori r'riunicatiri'g sirith said axial; 'rt c a ging is the atmosphere, m a r' haped, xhau tr a s eq axial port or said pn'ot disc seat; s'aidgpildt dis seat and, said base member aisg hail align i ar s aced mamas, pas

p l disc havin at bu'g dias asewa rr ,ed n po e ch d i..l a ,d fi hari dex stv assagewa ,arid ubdri a h ,angle relatiye t. id e pa a e y ce' r iio d a fi 3;. Y the angular ispacirig of the'ports iii saidpilot 'dise seat, the other le qr Said U-slidmgefdegkhfiit sagewaybeing adapted to "e'g'istj ith thef la'rly spaced ports iiis'aid pilot dis'c seiat, whereby when -sam;othe r 1eg orsaia u s apeg e aust passageway isal'igned with one o'f 'the port six saidi j i a ass z Ways of said pil otdisc is alig ied with the other p rt in saidi i di Sha and mea s ie iefiect. as rq a of sa d .P li. s se. mlufiiea a pi ot dia r g m unte asa ig o s n s id housing having a compartment on each side of a d pilot d a ra m i t. an raem bein operable in accordance with thevpressure dififil? ential in the compartments upomthe opposite sides of said pilot diaphragm; a rod connected with said pilot diaphragm arranged to be reciprocated by said pilot diaphragm; said rod having a series of ridges formed thereon, a gar meshing with said ridges, and a shaft 'ope'ratively interconnecting said gear'and' said pilot disc, to effet rotation thereof as said rod is reciprbbat'edi DONALD GIGRISWOLDI REFERENCES CITED i he followi ng refererioes are 6r re'cbid iii the file of this patent:

UNITED STATES PATENTS mb r i. MN T D 703,603 new: .\J1 1 1{ 1 1902. 836,317 Gerds Nov, 20', 1906 993,628 vyiui'am' :Ma5 l30, 1911 1319393 Hamilton Mai. 21, 1922 1,606,2 4? nang ':;-,l 2'; me. 9', 1926 1; 6 1 9, 948 MangiQmeii MaruB, 19277 1,820 67 old e I" DL QL. 13', 1 1,95 ,262 May-8, 19334 

